The Sync REST API

The Sync REST API allows you to control your Sync applications from backend servers in much the same way you can from the client. You can create, update and manage your documents, lists and maps using these resources.

HTTP requests to the REST API are protected with HTTP Basic authentication like
other REST APIs provided by Twilio. To learn more about how Twilio handles
authentication, please refer to our security documentation.
In short, you will use your Twilio account SID as the username and your
auth token as the password for HTTP Basic authentication.